What is the authentically human? What is the nature of the alien elements that are threatening and vitiating living, intelligent human beings? These questions are deeply rooted in Philip K. Dick's work, and to them he has provided a bizarre variety of answers, answers that are constantly being pushed aside and replaced by new possibilities. Finding an answer to the question of what is truly human and what only masquerades as human is, for Dick, the most important difficulty facing us. Some of Dick's richest metaphors stem from the profusion of electronic devices which populate his near-future wasteland landscapes—electronic constructs that in his early fiction menace the few humans surviving a nuclear holocaust; constructs that, evolving over the years toward ever more human forms, become instructors to man in the search for authenticity and wholeness.

The setting of Dick's near-future fiction is often a twilight world shrouded...